Tensile fracture of metallic glasses via shear band cavitation

被引：40

作者：

Luo, Jian ^{[1
]}

Shi, Yunfeng ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA

来源：

ACTA MATERIALIA | 2015年 / 82卷

基金：

美国国家科学基金会;

关键词：

Metallic glasses; Tensile fracture; Shear band cavitation; Molecular dynamics; SIMPLE MONATOMIC LIQUID; MOLECULAR-DYNAMICS; DUCTILE; BRITTLE; TRANSFORMATION; TEMPERATURE; TRANSITION; CRITERION; STRONGER; BEHAVIOR;

D O I：

10.1016/j.actamat.2014.09.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tensile fracture of metallic glasses due to shear-band-to-crack transition was studied by molecular dynamics. Such transition is difficult to characterize experimentally as it occurs within nanoseconds in the buried nanometer-thin shear band. We show that the sample fractures via shear band cavitation under high initial tensile stress, or with long sample length. The critical thermomechanical conditions for shear band cavitation, strongly influenced by shear, were identified. An analytical model was developed, leading to a length scale and a time scale for shear-band-to-crack transition. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：483 / 490

页数：8

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